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arXiv 2504.01476cs.CV

通过三模态重建增强跨模态3D检索

Enhanced Cross-modal 3D Retrieval via Tri-modal Reconstruction

The Hong Kong University of Science and Technology (Guangzhou)(香港科技大学(广州))

Junlong Ren, Hao Wang

AI总结:

提出三模态重建与对齐方法,通过多视图图像和点云联合表示3D形状,结合细粒度融合与困难负样本对比训练,显著提升了跨模态3D双向检索性能。

摘要:

跨模态3D检索是一项关键且具有挑战性的任务,旨在实现3D与文本模态之间的双向检索。当前方法主要依赖某种3D表示(例如点云),很少利用2D-3D一致性和互补关系,这限制了其性能。为了弥合这一差距,我们提出采用多视图图像和点云来共同表示3D形状,促进三模态对齐(即图像、点、文本)以增强跨模态3D检索。值得注意的是,我们引入三模态重建来提高编码器的泛化能力。给定点特征,我们在文本特征的指导下重建图像特征,反之亦然。通过良好对齐的点云和多视图图像特征,我们通过细粒度的2D-3D融合将它们聚合为多模态嵌入,以增强几何和语义理解。鉴于当前数据集中存在显著噪声,许多3D形状和文本共享相似语义,我们采用困难负样本对比训练来强调更具重要性的困难负样本,从而产生鲁棒的判别性嵌入。在Text2Shape数据集上的大量实验表明,我们的方法在形状到文本和文本到形状检索任务中均以显著优势优于先前最先进的方法。

英文摘要:

Cross-modal 3D retrieval is a critical yet challenging task, aiming to achieve bi-directional retrieval between 3D and text modalities. Current methods predominantly rely on a certain 3D representation (e.g., point cloud), with few exploiting the 2D-3D consistency and complementary relationships, which constrains their performance. To bridge this gap, we propose to adopt multi-view images and point clouds to jointly represent 3D shapes, facilitating tri-modal alignment (i.e., image, point, text) for enhanced cross-modal 3D retrieval. Notably, we introduce tri-modal reconstruction to improve the generalization ability of encoders. Given point features, we reconstruct image features under the guidance of text features, and vice versa. With well-aligned point cloud and multi-view image features, we aggregate them as multimodal embeddings through fine-grained 2D-3D fusion to enhance geometric and semantic understanding. Recognizing the significant noise in current datasets where many 3D shapes and texts share similar semantics, we employ hard negative contrastive training to emphasize harder negatives with greater significance, leading to robust discriminative embeddings. Extensive experiments on the Text2Shape dataset demonstrate that our method significantly outperforms previous state-of-the-art methods in both shape-to-text and text-to-shape retrieval tasks by a substantial margin.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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